Just installed a $270 AverMedia VP1.
The quality seems stupendous given the price, text was absolutely clear and nice white balance.
(Room is not overly bright and fluorescents were on.)
Small portable form factor, but not many other features (freeze, but no onboard storage of images, no USB to connect to computer etc).
It might pass through only SVGA (I know others have mentioned this as a negative/potential issue) as it did change the size/shape of the projected image (had to reorient the IWB).
The unit has RCA out as well and may use that instead of VGA for next year.